Sofa



FIG. 1 is a side perspective view of a first embodiment of a sofashowing my new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a side perspective view of a second embodiment of a sofashowing my new design;

FIG. 5 is a front perspective view thereof; and,

FIG. 6 is a front elevation view thereof.

CLAIM I claim the ornamental design for a sofa, as shown and described.